| 摘要 |
PURPOSE:To reduce the cost of a motor without influence of temperature drift and rotating ripple by using 3-phase AC tachometer generator as a rotating speed detector. CONSTITUTION:This controller has a 3-phase AC tachometer generator 9 for detecting the rotating speed, a rotating direction detector 22 for detecting the rotating direction from the output of the generator, a frequency/voltage converter 26 which switches a voltage corresponding to a reference voltage with frequency multiplied by integer times of the output frequency of the generator and producing a voltage proportional to the production of the output frequency by the reference voltage, a switch S3 for switching the output signal of the converter in response to the output signal of the rotating direction detector, and a code inverter 21 for inverting the output signal of the converter 26. The output signals of a normal/reverse speed instructing unit 1 and the code inverter 21 are inputted to a speed amplifier 2, and the output signal of the converter 26 is inputted through the resistor of resistance value R/2 and the switch S3, and the speed of a motor 8 is controlled by the output signal of the amplifier. |
